| 1 | /****************************************************************
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| 2 |
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| 3 | The author of this software is David M. Gay.
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| 4 |
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| 5 | Copyright (C) 1998 by Lucent Technologies
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| 6 | All Rights Reserved
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| 7 |
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| 8 | Permission to use, copy, modify, and distribute this software and
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| 9 | its documentation for any purpose and without fee is hereby
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| 10 | granted, provided that the above copyright notice appear in all
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| 11 | copies and that both that the copyright notice and this
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| 12 | permission notice and warranty disclaimer appear in supporting
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| 13 | documentation, and that the name of Lucent or any of its entities
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| 14 | not be used in advertising or publicity pertaining to
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| 15 | distribution of the software without specific, written prior
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| 16 | permission.
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| 17 |
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| 18 | LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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| 19 | INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
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| 20 | IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
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| 21 | SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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| 22 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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| 23 | IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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| 24 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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| 25 | THIS SOFTWARE.
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| 26 |
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| 27 | ****************************************************************/
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| 28 |
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| 29 | /* Please send bug reports to
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| 30 | David M. Gay
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| 31 | Bell Laboratories, Room 2C-463
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| 32 | 600 Mountain Avenue
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| 33 | Murray Hill, NJ 07974-0636
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| 34 | U.S.A.
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| 35 | dmg@bell-labs.com
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| 36 | */
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| 37 |
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| 38 | #include "gdtoaimp.h"
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| 39 |
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| 40 | char*
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| 41 | #ifdef KR_headers
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| 42 | g_ffmt(buf, f, ndig, bufsize) char *buf; float *f; int ndig; unsigned bufsize;
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| 43 | #else
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| 44 | g_ffmt(char *buf, float *f, int ndig, unsigned bufsize)
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| 45 | #endif
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| 46 | {
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| 47 | static FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, 0 };
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| 48 | char *b, *s, *se;
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| 49 | ULong bits[1], *L, sign;
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| 50 | int decpt, ex, i, mode;
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| 51 |
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| 52 | if (ndig < 0)
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| 53 | ndig = 0;
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| 54 | if (bufsize < ndig + 10)
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| 55 | return 0;
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| 56 |
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| 57 | L = (ULong*)f;
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| 58 | sign = L[0] & 0x80000000L;
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| 59 | if ((L[0] & 0x7f800000) == 0x7f800000) {
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| 60 | /* Infinity or NaN */
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| 61 | if (L[0] & 0x7fffff) {
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| 62 | return strcp(buf, "NaN");
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| 63 | }
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| 64 | b = buf;
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| 65 | if (sign)
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| 66 | *b++ = '-';
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| 67 | return strcp(b, "Infinity");
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| 68 | }
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| 69 | if (*f == 0.) {
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| 70 | b = buf;
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| 71 | #ifndef IGNORE_ZERO_SIGN
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| 72 | if (L[0] & 0x80000000L)
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| 73 | *b++ = '-';
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| 74 | #endif
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| 75 | *b++ = '0';
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| 76 | *b = 0;
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| 77 | return b;
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| 78 | }
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| 79 | bits[0] = L[0] & 0x7fffff;
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| 80 | if ( (ex = (L[0] >> 23) & 0xff) !=0)
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| 81 | bits[0] |= 0x800000;
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| 82 | else
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| 83 | ex = 1;
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| 84 | ex -= 0x7f + 23;
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| 85 | mode = 2;
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| 86 | if (ndig <= 0) {
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| 87 | if (bufsize < 16)
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| 88 | return 0;
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| 89 | mode = 0;
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| 90 | }
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| 91 | i = STRTOG_Normal;
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| 92 | s = gdtoa(&fpi, ex, bits, &i, mode, ndig, &decpt, &se);
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| 93 | return g__fmt(buf, s, se, decpt, sign);
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| 94 | }
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